diff --git a/src/backend/Board.java b/src/backend/Board.java
index 5687e9f..d5bcb6e 100644
--- a/src/backend/Board.java
+++ b/src/backend/Board.java
@@ -15,6 +15,14 @@ public class Board {
 	private int xTwo;
 	private int yTwo;
 	private boolean enPassant = false;
+	private boolean kingWMoved = false;
+	private boolean kingBMoved = false;
+	private boolean rookLWMoved = false;
+	private boolean rookRWMoved = false;
+	private boolean rookLBMoved = false;
+	private boolean rookRBMoved = false;
+	private boolean castling = false;
+	private boolean castlingDone = false;
 	
 	public Board(int colNum, int lineNum) {
 		this.colNum = colNum;
@@ -95,6 +103,15 @@ public class Board {
 	public void cleanBoard() {
 		turnNumber = 0;
 		pieces.clear();
+		enPassant = false;
+		kingWMoved = false;
+		kingBMoved = false;
+		rookLWMoved = false;
+		rookRWMoved = false;
+		rookLBMoved = false;
+		rookRBMoved = false;
+		castling = false;
+		castlingDone = false;
 	}
 	
 	public String toString() {
@@ -164,12 +181,65 @@ public class Board {
 					if (pieces.get(whatPiece(x,y)).isWhite() != pieces.get(whatPiece(this.x,this.y)).isWhite()) {//check if we do not move to a position occupied by a piece of the same color 
 						this.pieces.remove(whatPiece(x,y)); //if there is a piece at the position we want to move we remove it from the array list
 					}
+					else {//castling
+						if (castling == true) {
+									if (pieces.get(whatPiece(x,y)).getX()==7 || pieces.get(whatPiece(this.x,this.y)).getX()==7) {//that means we are dealing with the right rooks for castling
+										if (pieces.get(whatPiece(this.x,this.y)).isWhite()==true){
+											kingWMoved = true;
+											System.out.print("W");
+										}
+										else {
+											kingBMoved = true;
+											System.out.print("B");
+										}
+										pieces.get(whatPiece(7,y)).setX(5);
+										pieces.get(whatPiece(4,y)).setX(6);
+										this.x=-1;
+										this.y=-1;
+										this.turnNumber +=1;
+										castlingDone=true;
+									}
+
+									else {//that means we are dealing with the right rooks for castling
+										if (pieces.get(whatPiece(x,y)).isWhite()==true){
+											kingWMoved = true;
+										}
+										else {
+											kingBMoved = true;
+										}
+										pieces.get(whatPiece(0,y)).setX(3);
+										pieces.get(whatPiece(4,y)).setX(2);
+										this.x=-1;
+										this.y=-1;
+										this.turnNumber +=1;
+										castlingDone=true;
+									}
+						}
+					}
 				}
-				if(((this.positionOccupied(x, y) == false || pieces.get(whatPiece(x,y)).isWhite() != pieces.get(whatPiece(this.x,this.y)).isWhite())) && (highlights)) {//moves the piece only if the position selected is not occupied by a piece of the same color
+				if(((this.positionOccupied(x, y) == false || pieces.get(whatPiece(x,y)).isWhite() != pieces.get(whatPiece(this.x,this.y)).isWhite())) && (highlights) && castlingDone==false) {//moves the piece only if the position selected is not occupied by a piece of the same color
 					if (enPassant) {
 						this.pieces.remove(whatPiece(xTwo,yTwo));
 						enPassant = false;
 					}
+					if (pieces.get(whatPiece(this.x, this.y)).getX() == 0 && pieces.get(whatPiece(this.x, this.y)).getY() == 7) {
+						rookLWMoved = true;
+					}
+					if (pieces.get(whatPiece(this.x, this.y)).getX() == 7 && pieces.get(whatPiece(this.x, this.y)).getY() == 7) {
+						rookRWMoved = true;	
+					}
+					if (pieces.get(whatPiece(this.x, this.y)).getX() == 0 && pieces.get(whatPiece(this.x, this.y)).getY() == 0) {
+						rookLBMoved = true;
+					}
+					if (pieces.get(whatPiece(this.x, this.y)).getX() == 7 && pieces.get(whatPiece(this.x, this.y)).getY() == 0) {
+						rookRBMoved = true;	
+					}	
+					if (pieces.get(whatPiece(this.x, this.y)).getX() == 4 && pieces.get(whatPiece(this.x, this.y)).getY() == 7) {
+						kingWMoved = true;
+					}
+					if (pieces.get(whatPiece(this.x, this.y)).getX() == 4 && pieces.get(whatPiece(this.x, this.y)).getY() == 0) {
+						kingBMoved = true;
+					}
 					
 					int indexPiece = this.whatPiece(this.x, this.y);
 					
@@ -191,9 +261,11 @@ public class Board {
 				// we now reset our parameters 
 				this.x=-1;
 				this.y=-1;
+				castlingDone=false;
 				// we add 1 to the number of turned played
 			}
 		}
+			
 	}
 
 	public boolean isSelected(int x, int y) {
@@ -475,6 +547,55 @@ public class Board {
 							}
 						}
 					}
+					//check if the castling is possible, if yes highlight the rook(s)
+					int nbOccupied = 0;
+					boolean occupiedLeftLine = true;
+					boolean occupiedRightLine = true;
+					
+					for(int i = 3; i > 0; i--) {
+						if (positionOccupied(i,pieces.get(indexPieceSelect).getY()) == true) {
+							nbOccupied = nbOccupied + 1;
+						}
+						if (nbOccupied == 0) {
+							occupiedLeftLine=false;
+						}	
+					}
+					if (occupiedLeftLine == false) {//check if the castling is possible with the rooks on the left
+						if (kingWMoved == false && rookLWMoved == false && x==0 && y==7 && pieces.get(whatPiece(0,7)).isWhite() == pieces.get(indexPieceSelect).isWhite()) {
+							highlight = true;
+							castling = true;
+						}
+						if (kingBMoved == false && rookLBMoved == false && x==0 && y==0 && pieces.get(whatPiece(0,0)).isWhite() == pieces.get(indexPieceSelect).isWhite()) {
+							highlight = true;
+							castling = true;	
+					//	}
+						//else {
+							//castling = false;
+						}
+					}	
+					nbOccupied = 0;
+					for(int i = 5; i < 7; i++) {
+						if (positionOccupied(i,pieces.get(indexPieceSelect).getY()) == true) {
+							nbOccupied = nbOccupied + 1;
+						}
+						if (nbOccupied == 0) {
+							occupiedRightLine=false;
+						}	
+					}
+					if (occupiedRightLine == false) {//check if the castling is possible with the rooks on the right
+						if (kingWMoved == false && rookRWMoved == false && x==7 && y==7 && pieces.get(whatPiece(7,7)).isWhite() == pieces.get(indexPieceSelect).isWhite()) {
+							highlight = true;
+							castling = true;
+						}
+						if (kingBMoved == false && rookRBMoved == false && x==7 && y==0 && pieces.get(whatPiece(7,0)).isWhite() == pieces.get(indexPieceSelect).isWhite()) {
+							highlight = true;
+							castling = true;
+						}
+		//				else {
+	//						castling = false;
+						//}
+					}
+					nbOccupied = 0;
 				}
 			}
 			
@@ -536,6 +657,33 @@ public class Board {
 							if(pieces.get(whatPiece(x,y)).isWhite() != pieces.get(indexPieceSelect).isWhite()) {
 								highlight = true;
 							}
+							//check if the castling is possible, if yes highlight the king
+							if (pieces.get(indexPieceSelect).isWhite() == true) {//check if castling is possible for the white 
+								if (kingWMoved == false && rookLWMoved == false && x==4 && y==7 && pieces.get(indexPieceSelect).getX()==0 && pieces.get(indexPieceSelect).getY()==7) {
+									highlight = true;
+									castling = true;
+								}
+								if (kingWMoved == false && rookRWMoved == false && x==4 && y==7 && pieces.get(indexPieceSelect).getX()==7 && pieces.get(indexPieceSelect).getY()==7) {
+									highlight = true;
+									castling = true;
+								}
+								else {
+									castling = false;
+								}
+							}
+							if (pieces.get(indexPieceSelect).isWhite() == false) {//check if castling is possible for the black 
+								if (kingBMoved == false && rookLBMoved == false && x==4 && y==0 && pieces.get(indexPieceSelect).getX()==0 && pieces.get(indexPieceSelect).getY()==0) {
+									highlight = true;
+									castling = true;
+								}
+								if (kingBMoved == false && rookRBMoved == false && x==4 && y==0 && pieces.get(indexPieceSelect).getX()==7 && pieces.get(indexPieceSelect).getY()==0) {
+									highlight = true;
+									castling = true;
+								}
+								else {
+									castling = false;
+								}
+							}
 						}
 					}
 				}
diff --git a/src/backend/Game.java b/src/backend/Game.java
index 4c64f70..366bba1 100644
--- a/src/backend/Game.java
+++ b/src/backend/Game.java
@@ -98,7 +98,7 @@ public class Game extends Thread {
 	public boolean isHighlighted(int x, int y) {
 		return board.isHighlighted(x, y);
 	}
-
+	
 	public void undoLastMove() {
 		board.undoLastMove();
 	}